Compilation of Proprietory application for running on Vxworks

We are migrating out system from x86 processors to Arm9. There is one proprietary application which is currently in ELF format and is compiled by end customers using Open watcom. When we are using Vxworks and Arm9 I need some cross compiler which is generate ELF file for Arm9 and can be used by end customer for compiling the user logic. This should be freely available.